Please start a new topic in Development to discuss the serial transfer. That way the information will be easier to find for others wanting the same thing. Also I'm not sure what you mean - 'Receiving data from the zx81' implies that the zeddy will be sending to some other device - is that the case? ...

+1 for cleaning edge connector. And wiggling the ZXpand in-place with the power off. There is a slim possibility that the CPLD has become corrupted. Do a CPLD re-flash too using the second part of the instructions posted earlier and THIS file. The process takes 3-4 minutes, and it might look like no...

Hi sorry, I just spotted this. Pin 1 is not used in normal operation - it is normally RESET but it is disabled once the PIC is programmed. I am slightly ashamed that a bent pin wasn't noticed but that is probably because it has no use. How are things now? Is the problem still happening? It's most od...

Beautiful! I especially like the resistors hidden inside the footprint of the DIL socket. As I have another CPLD spare (unsure of its working status though) I think I should go for an issue 2 also. Is anyone else in the UK thinking of getting one? Would you be happy to combine shipping for a couple ...